Commentary for Nedarim 138:4

בעי רבה קיים ליכי היום מהו מי אמרינן כמאן דאמר לה מופר ליכי למחר או דלמא הא לא אמר לה

Rabbah propounded: What [if he declares], 'It be confirmed unto thee and annulled to thee simultaneously?'<span class="x" onmousemove="('comment',' [Or, if he said at one and the same time 'It be confirmed and annulled to thee']. ');">³</span> — Come and hear: For Rabbah said: Whatever is not [valid] consecutively, is not valid even simultaneously.<span class="x" onmousemove="('comment',' If one marries two sisters in succession, the second marriage is obviously invalid; hence, if one makes a simultaneous declaration of marriage to two sisters, such declaration is entirely null, v. Kid. 50b. Thus here too, since they could not both take effect if pronounced in succession, they are null when pronounced simultaneously. It is therefore as though he has not spoken at all, and he remains at liberty to confirm or annul the vow, as he pleases. ');">⁴</span> Rabbah propounded: What [if he declares], 'It be confirmed to thee to-day? Do we rule, it is as though he had said to her, 'but it be annulled unto thee to-morrow' [by implication], or perhaps he in fact did not declare thus?

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